Questions tagged [s-parameters]

Question 1

I have a 2-port device with the following S-Params: S11 = -41.1 dB S21 = S12 = -32.7 dB S22 = -0.0099 dB In other words, Port 1 is (perfectly) matched, but Port 2 not. If I change the device to having ...

Question 2

I’m working on a task where I need to determine the damping factor of an input filter on a PCB. The input filter is quite simple: TVS diode Reverse polarity protection Two LC stages with ferrite ...

Question 3

I have a filter, which shows a mismatch between input return loss (S11) and output return loss (S22). They are not equal at the frequency of interest, which is around 36 GHz. Would this affect the ...

Question 4

I measure the S parameters of a network and I would like to convert S11 to time domain to see the reflections vs. time. To achieve this, I measure (complex) S11 and then calculate the IFFT using ...

Question 5

I have simulated a 3D structure in HFSS and the figure below shows the "schematic" of the structure: there is a two-ports network and two transmission lines connected with different ...

Question 6

We evaluate RF amplifiers using actual equipment and a simulator (ADS). Since there are few types of inductance values for air-core coils that can be used in matching circuits over 100W, we make our ...

Question 7

I was performing some S11 measurement of an AC cable because I see some strange results when I connect it to a device. The cable length is 0.381m. The cable is sitting on a Reference ground plane, the ...

Question 8

I'm having a mixer IC working in the frequency as below: LO frequency: 4.9 GHz (generated by internal VCO) Port1 RF: 2.5 GHz Port2 IF: 2.4 GHz I want to measure the RF-to-IF isolation (that means I ...

Question 9

I have 3 sub-networks, which are described by ABCD matrices. I connected them together to form a 3-port circular network, described as follows: Port1 → ABCD1 → Port2 Port2 → ABCD2 → Port3 Port3 → ...

Question 10

Transformer is a two port system, I try to use simulation tool to find the s parameters for transformer. Here is my questions: How to accurately measure the s parameters for S11,S12,S21,S22. I find ...

Question 11

Normally, when we look at the s11 parameters from the feed point of a single-ended antenna, we can easily see the s11 reflection coefficient, yes. Now, the question I am wondering is this: I have a ...

Question 12

I have a netlist from which I have contained the S and Y-Parameters of my circuit. Now I need to analyse my circuit for passivity and stability. Normally, I would use the transfer function to do this. ...

Question 13

If we consider a simple TXline of length \$l\$ and characteristic impedance \$Z_1\$, theoretically, its S parameters are $$ S_{11}=\frac{Z_1-Z_0}{Z_1+Z_0} $$ $$ S_{21}=e^{-j\theta} $$ $$ S_{11}=S_{22},...

Question 14

Question(s) Is the math below correct? If not, then what should be changed? If you know of an authoritative reference for this derivation, then please post it in an answer, or in the comments. ...

Question 15

I am attempting to replicate the S-parameter curve for an antenna design as described in the paper "Antenna Design and Analysis" with DOI: 10.1109/LAWP.2009.2015345 using ANSYS HFSS 15. Here ...

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Questions tagged [s-parameters]

Correct S21 for a Port-2-mismatch

Unexpected S-parameter results when measuring input filter damping factor with VNA

Mismatch between input return loss and output return loss

Frequency domain S11 to time domain conversion

How to evaluate input impedance on HFSS

How can I convert S-parameters between series and parallel?

Suspected resonance from an S11 measurement

Mixer RF-to-IF isolation

S-matrix of a 3-port circular network

S parameter for transformer

Measurement of s11 of differential output antenna transmitter

Stability analysis from S-Parameter / Y-Parameter

The Theoretical and simulated S parameters of a TXline

Derive S-Parameter Matrices for Interconnected Multi-Port Networks of Arbitrary Size

Unable to replicate Twisted IFA antenna S-parameter curve using ANSYS HFSS 15

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